Bit.



No. 736,998; PATENTED AUG. 25, 1903.

W. o. MOORHBAD.

BIT.

APPLICATION FILED D110. 12, 1902.

170 MODEL.

5] wuowtoz UNITED STATES Patented August 25, 1903.

PATENT OFFICE.

WALTER O. MOORHEAD, OF SENEOAVILLE, OHIO, ASSIGNOR OF ONE-HALF TO OLIVERO. EBERLY, OF SENEOAVILLE, OHIO.

SPECIFICATION forming part of Letters Patent N 0. 736,998, dated August25, 1903.

' Application filed December 12,1902. Serial No. 135,001. (No model.)

.To all whom it may concern.-

Be it known that I, WALTER O. MoonHnAD, a citizen of the United States,residing at Senecaville, in the county of Guernsey, State of Ohio, haveinvented certain new and useful Improvements in Bits; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as Will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to bits for miningmachines; and it has for itsobject to provide a bit which will be less worn in the cutting operationthan the ordinary chisel-shaped bit usually employed and in theoperation of which bit there will be less energy required.

A further object of the invention is to provide a bit which may beeasily and quickly dressed.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in both views, Figurel is a perspective View showing a bit embodying the present invention.Fig. 2 is a side elevation of the bit.

Referring now to the drawings, there is shown a bit comprisin g atransversely-rectangular stem 5, at one. end of which is formed acutting-point 6, said cutting point or blade being in the form of arectangular pyramid the axis of which intersects the axis of the stem atan obtuse angle, while the side faces of the blade are at obtuse anglesto the corresponding side faces of the stems. At the points of meetingof the sides of the stem and the corresponding side faces of the bladethe facesof the bit are rounded, as illustrated.

In the use of the present bit it is secured in the mining-machine in thesame manner as the usual chisel-shaped bit, and the machine is operatedin the usual manner. Owing to the particular shape of the blade of thebit it enters the coal more readily than the chisel-shaped bit, and thusrequires less energy to operate it, and it is found in practice that itdoes not dull so quickly and that it is more easily and quickly dressed,so that its use is more economical.

The present bit comprises a cutting edge at each side of the upper faceof its blade and at the broadest portion of the blade, so that indrawing the blade upwardly through the coal there is a minimum tendencyto wedging of the blade, this arrangement of the two cutting edges beingdistinguished from .a structure in which a pyramidal blade is disposedwith an edge in the middle of the upper side of the blade, so-that theaxes of the stem and blade lie in a plane diagonal to the stem andblade, and I claim no part of such arrangement as my invention.

What is claimed is- A bit for mining-machines, consisting of a stem anda blade, the stem being rectangular in cross-section and the bladehaving the shape of a square pyramid, the axis of which lies at anobtuse angle to the axis of the stem, the axes of the stem and bladelying in a plane which intersects the upper and lower faces of the stemand blade at right angles, and the blade presenting a single cuttingedge at each side of its upper face, which cutting edges converge to thepoint of the blade.

In testimony whereof I affix my signature in presence of two witnesses.

WALTER O. MOORHEAD.

Witnesses:

G, D. DUGAN, I. 0. MOILYAR.

